Threads like these do not start well and end worse.
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Good question, according to topic starter previous posts :Has anybody asked how "deep" he plans to go? Deep for you may mean something different than him and not require "technical training for deep dives involving advanced nitrox and decompression"? Maybe deep for him is 80 feet.
Let's do simple math (sorry for metric, it is more easy for me):13CF should be plenty even If I ran out at maximum depth.
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I do not wish to make a panic accent
truly redundant air supply